June 2018
Intermediate to advanced
280 pages
7h 46m
English
Content preview from Design Patterns and Best Practices in Java
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The groupBy operator
groupBy is used to divide an Observable into a set of Observables that each emit a different group of items. The following code groups strings by the starting letter and then prints the keys and the group data for the specific key. Notice that the groups are Observables that can be used to construct other dataflows.
The following output shows the groups by the first letter as a group and also the group key, which is the first letter:
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